Slip flask



Patented Jan. 24, 1939 UNITED STATES SLIP FLASK William J. Spensley, Dubuque, Iowa, assignor to The Adams Company, Dubuque, Iowa, a corporation of Iowa Application November 3, 1937, Serial No. 172,535

4 Claims.

This invention relates to slip flasks of the type used in the manufacture of sand molds in metal founding. An important object of the invention is the provision of a generally improved slip ilask having improved sand strip mechanism wherein the sand strip is supported between the cope and the drag in a novel manner providing an improved combination of sand strip, strip retaining and guiding means, and cope supporting means.

Other objects and advantages will become apparent from the description and drawings, in which- Figure 1 is an end view of a slip flask embodying my invention;

Fig. 2 is a bottom View of the cope shown in Figure 1 showing details of the sand strip mechanism;

Figs. 3 and 4 are sections on the lines 3-3 and 4 4 of Fig. 2, and

Fig. 5 is a fragmentary section through one wall of the iiask showing a mold and pattern plate in position with the sand strip inserted.

The invention contemplates a slip iiask of the type having a cope as shown at 6 and a drag 'I between which a pattern plate designated generally by the numeral 8 is adapted to be inserted and lwithin which the usual molding sand is packed to produce cope and drag mold portions 9 and I I, respectively, in accordance with the usual foundry practice, as described in my Patent No. 2,066,547, over which the present construction is an improvement. Ears I2 and I3 are attached to opposite sides of the cope and carry bearing members I4 and I5 which receive pins I6 attached to opposite sides of the drag as shown at II, the pins and ears serving to maintain the cope and drag in alignment and permit removal of the cope from the drag in the usual manner.

In this instance the upper and lower edges of the drag are provided with metal strips I8 and I9, and the upper edge of the cope is provided with a strip 2l, the strips I8, I9 and 2I extending completely around the flask and being attached thereto by means of screws as sho-wn at 22.

Referring now more particularly to Fig. 2, a sand strip composed of two sections designated generally by the numerals 23 and 24 is positioned on the lower edge of the cope, each of these sections extending between diagonally opposed corners of the cope and along the lower edge thereof so that each section consists of two legs 25 and 26 joined together at one extremity to form a right angle, the inner edge of the sand strip portion thus formed being continuous from end to end of the portion. As will be seen from Fig. 5, the legs 25 and 26 each consist of a solid piece of metal having its inner edge beveled outwardly toward the upper surface as shown at 2l. The

lower surface of the strip is recessed as shown 1 ment of the strip, the ends of the slots being positioned parallel to a diagonal connecting intermediate corners of the ilask as shown at 32 to function in guiding the strip in its movement to and from the engaged position shown in Fig. 5.

The retainer members 29, best shown in Figs. 2 and 4, each have a relatively long central portion 33 adapted to seat against the lower edge of the cope and secured thereto by means of screws 34, the thickness of the central portion being slightly greater than the thickness of the marginal portion 35 of the sand strip adjacent the inner edge thereof. The retainer members also have outwardly extending end portions 36 and 31 spaced from the edge of the cope a distance slightly greater than the thickness of the recessed portion 38 of the sand strip so as to receive the recessed portion of the sand strip therebetween .and provide a small amount of clearance as shown at 39 for free movement of the sand strip along the outwardly extending end portions 36 and 3l. The ends 4I of the central portion 33 are also parallel with a diagonal connecting the intermediate corners of the cope sor as to be complemental with the ends 32 of the slots and to cooperate therewith in 'guiding the movement of the sand strips. It will be observed that the sand strip portion 23 in Fig. 2 is shown in the inner or engaged position, and the portion 24 is shown in the outer or disengaged position, and it will be understood that the'strip is movable between said positions. In the inner or engaged position the strip serves to retain the' cope half S'of the mold so that when the two parts of the mold are separated the weight of the cope half is carried by the sand strip .and transmitted to the outwardly extending ends 36 and 31 of the retainer members.

Supporting and guiding corner plates 42 and 43 are attached to the lower edge of the cope at diagonally opposite corners and are of slightly greater thickness than the marginal portions 35 of the sand strip. These plates are in the general form of right-angled triangles, the hypothenuse of which forms abutments and guideways for the ends of the sand strip portions 23 and 24. In other words, the free ends of the legs 25 and 26 of each sand strip portion abut against the edges of the plates 42 and 43 as shown at 44 and 45. It will be seen that since the sand strip portions are unitary, the inner edges of the plates form parallel guideways for the angularly formed ends of the sand strip portions so that they guide the sand strip portions in their movement to and from the engaged position.

Each of the sand strip portions has a bracket 46 having end portions 41 and 48 seated in the recess 28 of the legs 25 and 26 and connecting the legs at their junction, spanning the corner at which the legs thereof are joined as shown in Figs. 2 and 4, the brackets being of substantially the same thickness as the marginal portion 35 of the strips and being recessed in the end portions 41 and 48 for the reception of the ends of the legs 24 and 25. The brackets 45 have an opening at the corner of the cope, the edges of the opening having a right-angled apex formed by the edges 49, parallel side walls l and 52, and a base 53 connecting the walls 5l and 52 adapted for the reception of triangular supporting and guiding members 54 and 55, the members 54 and 55 guiding the movement of the sand strip by contact of the corners thereof against the parallel edges 5l and 52, and limiting the extent of movement by contact of the faces against the edge portion 53 or the edge portions 49. The members 54 and 55 are of substantially the same thickness as the plates 42 and 43 so that when the cope is placed on the drag as shown in Figure 1, or on the pattern plate as shown in Fig. 5, the entire weight of the cope is carried on the members 42, 43, and 54 and 55, spacing the retainer members 29 a slight distance from the top of the drag or the pattern plate, as the case may be, the amount of this spacing being preferably in the nature of a few thousandths but suhcient to prevent the weight of the cope from being carried on the sand strip portions or the retainer members, whereby they may be displaced by the violent forces applied in jolting machines. The brackets extend outwardly beyond the outer surface of the flask as shown in Figure 1 and have an ear 56 to which a lever 51 is attached by means of a pin 58. One end of the lever 51 is articulated on a bracket 59 attached to the outer surface of the ask, by means of a bolt 6l. The opposite end of the lever 51 is flared as shown at 62 for manual rotation of the lever about the bolt 5I. Thus, by rotation of the levers 51 the sand strip portions are inserted or withdrawn from the exterior of the flask, the plates 42, 43, 55 and 55 and the retainer members 2S serving to guide the sand strip portions so that they move on a diagonal of the flask.

It will be seen that because of the relative thickness of the various elements, the plates 42 and 43 and the supporting and guiding members 54 and 55 serve to support the entire weight of the cope so that there is no appreciable contact between the retainer members 01 the sand strips and the drag or pattern plate, as the case may be. Because of this, the diculties associated with the deformation of the retainer members or sand strips by the violent action of jolting machines is substantially eliminated. This is further assisted by the relatively small distance through which the end portions 36 and 31 of the retainer members underlie the legs of the sand strip which imparts considerable strength to these portions and permits them to resist distortion. Furthermore, the relatively wide area of contact between the central portion 33 of the retainer members and the edge of the cope effectively prevents these members from being driven or embedded into the surface of the cope and thus changing or reducing the clearance of the sand strip. Likewise, the provision of the slots 3l having the diagonal ends 32 and the complementary shape characteristics of the retainer members effectively functions in guiding the movement of the sand strip. Likewise, the position of the retainer members substantially midway between the edges of the sand strip effectively prevents tilting of the strip under the load occasioned by the cope portion of the mold and the resultant distortion of the parts.

It will be understood that the specic embodiment of the invention herein described and illustrated is by way of illustration, and I vdo Anot wish to be limited thereby except as required by the prior art.

I claim:

l. The combination in a slip flask having a cope and a drag of a sand strip mechanism comprising a sand strip having the marginal portion adjacent the inner edge of substantially greater thickness than the remainder thereof, the thinner portion of said striphaving spaced slots, strip retaining means in said slots secured to the edge of the cope and of slightly greater thickness than said marginal portion whereby said marginal portion substantially iills the space between the cope and the drag, said means having a centrally disposed portion abutting against the edge of the cope and end portions spaced from the edge of the cope overhanging the strip tc retain the strip against the cope, and manually operable means for moving the sand'strips.

2. The combination in a slip flask having a cope and a drag of a sand strip mechanism comprising a sand strip attached to the drag edge of the cope, the marginal portion of the strip adjacent the inner edge being of substantially greater thickness than the main body of the strip, the thinner portion of said strip` having spaced slots, strip retaining means in said slots secured to the edge of the cope having a centrally disposed portion abutting against the edge of the cope of substantially the length of said slots to guide the strip by contact thereagainst and having end portions spaced from the edge of the cope overhanging the strip to retain the strip against the cope, and manually operable means for moving the sand strips.

3. The combination in a slip flask -having a cope and a drag of a sand strip mechanism comprising a sand strip having the marginal portion adjacent the inner edge of substantially greater thickness than the remainder thereof, the thinner portion thereof having spaced diagonal slots, strip retaining means in said slots secured to the edge of the cope and of slightly greater thickness than said marginal portion, said means having a centrally disposed portion seated in the slot and abutting against the edge oi the cope, said portion being of substantially the length of the slots and the ends thereof being complementary to the ends of said slots to guide the strip by contact thereagainst, said means also having end portions spaced from the edge of the cope a distance slightly greater than the thickness of the remainder of said strip and overhanging the strip to retain the strip against the cope and limit the inward movement of the strip by contact with said marginal portion, and manually operable means for moving the sand strips.

4. The combination in a slip ask having a cope and a drag of a sand strip mechanism comprising a sand strip having the marginal p0rtion adjacent the inner edge of substantially greater thickness than the remainder thereof, the thinner portion of said strip having spaced slots, strip retaining means in said slots secured to the edge of the cope and of slightly greater thickness than said marginal portion whereby said marginal portion substantially lls the space between the cope and the drag, said means having a centrally disposed portion abutting against the edge of the cope, and end portions spaced from the edge of the cope overhanging the strip to retain the strip against the cope, said strip comprising two portions each extending along two sides of the cope, the two portions meeting at diagonally opposed corners of the cope, the ends of said portions bein-g parallel with a diagonal connecting intermediate corner, each of said portions having an opening therethrough at said intermediate corners, manually operable means at said intermediate corners for moving said portions in and out along the edge of the cope, guiding means in said openings attached to the edge of the cope for guiding the strip and limiting the inward movement thereof, and guiding means attached to the edge of the cope at the corners complemental to said ends for guiding the movement of said strip portions, each of said guiding means being of slightly greater thickness than the said strip portions and the retaining means for completely supporting the weight, of the cope on the drag.

` WILLIAM J. SPENSLEY. 

